Tim Rau schrieb:
> What makes python decide whether a particular variable is global or
> local? I've got a list and a integer, both defined at top level, no
> indentation, right next to each other:
>
> allThings = []
> nextID = 0
>
> and yet, in the middle of a function, python sees one and doesn't see
> the other:
>
> class ship(thing):
> ###snip###
> def step(self):
> ###snip###
> if keys[K_up]
> for n in range(0,2): #sparks/newton second is
> proportional to framerate
> divergence = 5.0
> p = self.body.getRelPointPos((-0.15,0,0))
> v = self.body.vectorToWorld((-100+ random.uniform(-
> divergence,divergence) ,random.uniform(-divergence,divergence),0))
> allThings.append(particle(p,v))
> allThings[len(allThings)-1].id = nextID
> nextID += 1
>
>
> I don't think it's important, but the function is defined before the
> two globals. What gives?
The difference is that you assign to nextID in your function. Statements
of the form
foo = expression
will make foo a function-local variable.
If you want it to be a module-global, you need to do
global foo
foo = expression
If you do this:
bar = 10
def f():
print bar
you don't assign to a variable, but only read. So if it's not found
locally, it will be looked up globally.
Diez
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